Thanks a lot for looking into it!
It does not seem to produce the desired effect on my end.

Could you explain how changing
return {{Meta = get_default_code_class},
        {Code = add_default_code_class},
        {CodeBlock = add_default_code_class}}
into
return {{Meta=get_default_code_class}, {CodeBlock=add_default_code_class}}
(as far as I can tell, this is the only modification) is supposed to
achieve the desired effect?

Thanks!

Le ven. 20 août 2021 à 11:57, William Lupton <wlupton@broadband-forum.org>
a écrit :

> I think you need a two-pass filter, one to pick up the metadata and the
> other to use it (this is because Meta is called nearly last).
>
> This works (I've re-ordered your functions and declared a local variable,
> but this probably wasn't necessary).
>
> *% *cat default-code-class.lua
>
> local default_code_classes = {}
>
>
> function get_default_code_class(meta)
>
>   if meta['default-code-class'] then
>
>     default_code_classes =
> {pandoc.utils.stringify(meta['default-code-class'])}
>
>   end
>
> end
>
>
> function add_default_code_class(el)
>
>   if #(el.classes) == 0 then
>
>     el.classes = default_code_classes
>
>     return el
>
>   end
>
> end
>
>
> return {{Meta=get_default_code_class}, {CodeBlock=add_default_code_class}}
>
>
> *% *pandoc -L default-code-class.lua code.md -M default-code-class="c
> numberLines"
>
> <pre class="c numberLines"><code></code></pre>
>
> On Fri, 20 Aug 2021 at 16:29, Clément Aubert <aubert.clement@gmail.com>
> wrote:
>
>> Hi,
>>
>> This question relates to
>> https://github.com/jgm/pandoc/issues/2104#issuecomment-595983954
>> There is a lua filter containing
>>
>> ``` lua
>> function add_default_code_class(el)
>>   if #(el.classes) == 0 then
>>     el.classes = default_code_classes
>>     return el
>>   end
>> end
>>
>> function get_default_code_class(meta)
>>   if meta['default-code-class'] then
>>     default_code_classes =
>> {pandoc.utils.stringify(meta['default-code-class'])}
>>   end
>> end
>> ```
>>
>> and I'm trying to tweak it so that two classes can be passed from the
>> command-line, eg. using
>>
>> --lua-filter default-code-class.lua -M default-code-class=c, numberLines
>>
>> but can't find a way.
>>
>> Thanks!
>> Clément.
>>
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